The Kingpriest of Istar is a title held by the leader of Istar which is effectively a theocracy. The last Kingpriest, Beldinas Pilofiro, eventually outlaws the worship of all evil and neutral gods and arrogantly demanded he be given the power to control humanity, one of those acts responsible for causing the Cataclysm, when the Burning Hammer foretold by a former friend of Beldinas comes crashing down on Krynn, destroying the Holy Empire of Istar on the Continent of Ansalon.